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Difficulty: MediumHematology and Oncology

Match the following characteristic peripheral blood smear descriptions to the most likely underlying hematologic diagnosis.

  • Peripheral blood smear shows small, mature-appearing lymphocytes with scant cytoplasm and numerous 'smudge' cells.Chronic lymphocytic leukemia
  • Peripheral blood smear reveals red blood cells with 'bite-like' deformities and Heinz bodies seen on supravital stain.Glucose-6-phosphate dehydrogenase deficiency
  • Peripheral blood smear demonstrates numerous fragmented red blood cells (schistocytes) and profound thrombocytopenia.Thrombotic thrombocytopenic purpura
  • Peripheral blood smear displays large, oval-shaped red blood cells (macroovalocytes) and hypersegmented neutrophils.Vitamin B12 deficiency

Answer

Smudge cells correspond to Chronic lymphocytic leukemia; bite cells and Heinz bodies correspond to Glucose-6-phosphate dehydrogenase deficiency; schistocytes correspond to Thrombotic thrombocytopenic purpura; and hypersegmented neutrophils correspond to Vitamin B12 deficiency.
Correctly matching the morphological descriptions requires applying the underlying pathophysiology to its visual manifestation: fragile cell membranes in leukemia result in smudge cells, oxidative damage in enzyme deficiency forms Heinz bodies and bite cells, mechanical shearing in small vessels generates schistocytes, and delayed DNA replication in nutritional deficiency leads to hypersegmented nuclear structures.

Step-by-Step Solution

1
Evaluate the first description highlighting smudge cells and mature-appearing lymphocytes.
Identify the condition as Chronic lymphocytic leukemia.
Neoplastic cells in this leukemia are structurally fragile and easily disrupted mechanically on a glass slide.
2
Evaluate the second description highlighting bite cells and Heinz bodies.
Identify the condition as Glucose-6-phosphate dehydrogenase deficiency.
The absence of normal oxidative defense mechanisms causes hemoglobin denaturation, leading to typical inclusion bodies that are removed by the spleen.
3
Evaluate the third description highlighting schistocytes and profound thrombocytopenia.
Identify the condition as Thrombotic thrombocytopenic purpura.
Systemic microthrombi cause both mechanical damage to red blood cells (forming schistocytes) and consumption of platelets.
4
Evaluate the fourth description highlighting macroovalocytes and hypersegmented neutrophils.
Identify the condition as Vitamin B12 deficiency.
Disrupted cell division and delayed nuclear maturation across hematopoietic cell lines cause distinctive megaloblastic morphological changes.

Key Concept

Recognizing specific pathognomonic peripheral blood smear findings is highly effective in differentiating among various leukemias, enzymatic defects, microangiopathic processes, and nutritional deficiencies.
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Topics

Hematology and Oncology

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